// <editor-fold defaultstate="collapsed" desc="GNU GPLv3 Header">
/*
 * File:   DigitalFilterByte.java
 *
 * Copyright (C) 2013 Robert Antoni Buj Gelonch <rbuj@uoc.edu>
 * Copyright (C) 2013 David Megias Jimenez <dmegias@uoc.edu>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
// </editor-fold>
package uoc.libfilter.DigitalFilter;

// <editor-fold defaultstate="collapsed" desc="imports">
import java.util.Arrays;
import java.util.Iterator;
import java.util.LinkedList;
// </editor-fold>

/**
 *
 * @author Robert Antoni Buj Gelonch <rbuj@uoc.edu>
 * @version 1.0
 * @since 2013-08-15
 */
public class DigitalFilterByte extends DigitalFilter <Byte>{

    /**
     *
     * @since 2013-08-15
     */
    public DigitalFilterByte(){

    }
    
    /**
     *
     * @param aCoefficients
     *
     * @since 2013-08-15
     */
    public DigitalFilterByte(Double[] aCoefficients) {
        lCoefficients = Arrays.asList(aCoefficients);
        lSamples = new LinkedList<Byte>();
        for (int i = 0; i < lCoefficients.size(); i++) {
            lSamples.addLast((byte) 0);
        }
    }

    /**
     *
     * @param aCoefficients
     *
     * @since 2013-08-15
     */
    public void initialize(Double[] aCoefficients) {
        lCoefficients = Arrays.asList(aCoefficients);
        lSamples = new LinkedList<Byte>();
        for (int i = 0; i < lCoefficients.size(); i++) {
            lSamples.addLast((byte) 0);
        }
    }

    /**
     *
     * @param sample
     * @return
     *
     * @since 2013-08-15
     */
    public double filter(Byte sample) {
        double result = 0;
        short removed = lSamples.removeLast();
        lSamples.addFirst(sample);
        Iterator<Double> coefficientsIterator = lCoefficients.iterator();
        Iterator<Byte> samplesIterator = lSamples.iterator();
        while (coefficientsIterator.hasNext()) {
            result += coefficientsIterator.next() * (double) samplesIterator.next();
        }
        return result;
    }

    /**
     *
     * @since 2013-08-19
     */
    public void clear(){
        lSamples.clear();
        for (int i = 0; i < lCoefficients.size(); i++) {
            lSamples.addLast((byte) 0);
        }
    }
}
